Valve



Patented May 19, 1942 pia-irse This invention relates 'to valves, andparticularly to a type of valve coritrollinghot' acid steam underhighlpressures.

"It has' been found Vin actualpracticelthat valves which Vcontrolpassage of hot acidfsteamV wear i away quickly, particularly if there`isa'ny abrasive `material in the steam.- Not only do'thevalvesthemselves'deteriorate,l "but "the valve? seats frloecome' pitted sothat the valves donot-fcloseproperly. -Hence, valves operatingfunderhi'ghlpressuresmust be renewed" frequently iand! constantlywatchedfotherwise failure occurs.

"The present invention has for anobject a valve of long life vandonewherein the valve is protected from het acid steam-when the valve islopen. I l

Another object is the provision rof a valve structurewherein the'seat isso arrangedlas to not readily be cut away.

Anotherobject consists .in a valve structure wherein the valve seatmaybe.pitted.without, however, directly aiecting proper seating andclosingaction of the Valvek to said seat.

In the practiceomy invention, I have so-arranged the inlet and outletopenings of a Vvalve casing that a substantially straight flow path isaiorded therebetween. Such deviation `as"oc curs is through 'a valveseatmember so arranged that two'valves are adapted to 'be'closedthereagainst or opened. 'In one instance, and cn the intake sideiof thecasing, the valveiseat yis/provided with an vinternal taper'and theoutlet end of the valve is `provided with an externallytapered seat.Thus passage of hot acid steam un' der pressure does not appreciablya'ect either valve seat. In both instances, the valve' members Varemovable out of the 'flow 'path of 'the steam and one valve yisprotected'from' Contact with the steam when the valve is open.

Other objects 'of the .invention consist of -a valve forthepurposestated whichis inexpensive in cost of manufacture, of fewparts, easily operated, andgenerallysuperior in point of durability andlong'life to valves now known to the inventor. K

With the above mentioned and other objects in view, the inventionconsists in the novel and useful provision, formation, construction,association, and relative arrangement of parts, members and features,all as shown in certain embodiments in the accompanying drawing,described generally, and more particularly pointed out in the claim.

A"In the drawing: A

jvF'igureis a longitudinal'sectionalvew of'V the valve and associatedv'meehanism,

vFigure 2is ya Isectional Vview on the line Y2---2 vof Figure 1,

`l1"iguref3is'a sectional View on the line 3--3 off-Figure 1,"and,

`tecting one I of the -valve=` elements.

fRefer'ringi now with particularityE tofthe draw vingpthe improvedvalvestructure is designated as Van entirety by the numeral I, and wherein 2isa-valve body or casing provided with an inlet f port 3 and an outletport` 4. The inlet and outlet ports arefscrew-threaded at 5 and Ii,respectively, it being noted that the `axis of. said two ports-is inalignment. The casing isr internally provided-with an-annular flange?,screw-threadked .atf8, to accommodatefa valveseat member.

YThe-valve seat member has-acentralbore IIJ, an

external flange I I 'and a screw-threaded'portion- I2. The threads I2are'adapted towcooperate-with the threads'fthe flange II acting as astop. The valve member Il' is provided withzan internally "tapered valveYseat I3 and Vwithv an externally `tapered valveseat I4. The casing isenlargedfat Ifand internally threaded Yat I6,r

tozaccommodatea bonnet I-'I threadedrat I8 rfor cooperation with thethreads I6. This Vbonnet includes anelongated partzI-Qwhich is threadedl at 2U and externally threaded atfZI. A valve stern :22.isfpassedthroughthe elongated partIS, Ithe stern being enlargedL as to diameterand ythreaded at'23ffor cooperation `with the 'threads 2B.

threads 2 I. Theouter end of ythe stem 22 4carries varhandfwheel'l.Rotation of the hand wheel `rotates the' stem'andcauses travel thereofdue to rthe threaded Vengagernent'witl'rthe bonnet.

vThe finner end'ofthe stem carries a valve asls'embly 2 8," whichincludes the valve i 2 9 provided vwith'iaitaperedsurface 30andY-afredueed diameterf threaded portion 3I,-which hasthreadedengagement with a cap nut 32. This cap nut holds in place amember 33 for holding the valve assembly to the stem. The stem isprovided with a head 34 with a reduced diameter portion between saidhead and the screw-threaded portion of the stem, as shown at 35. Themember 33 is carried on the reduced diameter portion 35 and.

has a ange 36 included between the cap nut and an end of the valve. Inthis manner, the

The sternisrpassed through a packing vZIIv heldin place rby a fgland nut25, -thergland nutY in`turn fbeing held bya Vcap nut'i26 ysecured tovalve assembly is held to the stem and so that the stem may be rotatedwithout the Valve turning when the valve is seated.

The casing is enlarged at 31 and internally screw-threaded at 38 toaccommodate the bonnet 38. An extension 40, identical with the extensionI8, has passed therethrough a valve stem 4I provided at its outer endwith a hand wheel 42, the valve stem carrying at its inner end a valveassembly 43. As this valve assembly is secured to the valve stem in thesame manner that the other valve member is secured to its stem, theconstruction will not be detailed, nor will the construction be detailedas to the cap and gland nut surrounding the stem 4I.

The valve 44 of the valve assembly is provided with an internallytapered seatV 45 to cooperate with the externally tapered seat I4. It isnoted that the two valves are in axial alignment, as are likewise thestems 22 and 4I. The casing is enlarged transversely at the Zone 46"(see Figure 2), to internally accommodate a pair of segmental shutters41 and 48. One shutter is provided with a groove 49 and the othershutter with a tongue S. Each shutter is provided with an arm 5I and 52carrying gearsV 53 and 54, the teeth of which intermesh, as shown at 55.The casing is enlarged at 56 to accommodate the gears, and the gear 54is mounted on a stud shaft having bearings in the enlarged portion ofthe casing, while the other gear is carried on a squared end 51 of ashaft 58. This shaft is passed through a stuffing gland 5S and a glandnut 60, the nut l A sleeve 63 is slidable upon the extension 4B andcarries a lug 64. This sleeve, when moved to the position shown inFigure 1, will prevent 5 the lever S2 from being rocked to a closedposition, and when rocked to an open position, the lug of the sleeve mayengage the lever to hold the lever against movement.

The operation, uses and advantages of the invention are as follows:

If we assume that a pipe 65 is secured to the threads 5 and leads to asource of hot acid steam under high pressure, and that a pipe B6 issecured to the threads 6, which provides the outlet pipe, the valve 28would remain seated until the valve 44 was moved within its bonnet 39and the segmental shutters 41 and 481 closed as, for instance,illustrated in Figure 4, whereupon the valve 28 would be opened in theusual manner by turning the hand wheel 21. The hot acid steam would thenflow Within the valve casing, and particularly into the inlet chamberportion 61 through the opening I8 of the valve seat member, thence intooutlet chamber portion 68 'through pipe es. 11; will be noted that inthe passage of the uid, the valve 28 is substantially out of contactwith the steam, in that the said valve would be withdrawn into thebonnet I1. The fluid "will contact, in its passage through the valve,with the tapered seat I3 but be substantially out of contact so far asrapid iiow of the iiuid is concerned with the tapered external seat I4.It is, of course, realized that the uid will possibly surround the seatI4, but the seat is out of the direct flow path. It has been found thatthe valve seat I3 is not appreciably affected by the passage of fluidthrough the opening I0, and the seat I4 is not affected at all. However,it is necessary to protect the valve 44 from contact with the steam,which would rapidly cut it away and render the valve useless after ashort period of time. By providing the pair of shutters 41 and 48, theshutters may be closed across the valve and protect the same fromimpingement thereon by the fluid. When it is desired Vto stop the flowof uid from inlet to outlet, the valve 28 is first closed, whereupon thelever 62 may be moved to open the shutters to the position shown inFigure 2, whereupon valve 44 may be closed against the seat I4.

The present invention `is adaptable to many types of fluid other thanhot acid steam. The

device is adapted to handle any fluid operating under high pressure. Tothis end, it has been found best to utilize two valves. When the fluidenters the chamber 61., its path is diverted in moving into chamber 68,the valves being open. The Valve seat member to an extent directs the owpath, and for this reason, the shutters are provided to protect thevalve 44. The valve 44 would ordinarily be the rst valve to be cut awayand rendered useless, due to constant impingement thereon of the fluid.However, by providing the two-valve structure wherein one valve isclosed prior to moving the shutters to close the second Valve, astructure results wherein long life for both valves results, andconstant assurance that the fluid under high pressure'iseffectively shutoff in its flow, and without leakage.

I claim:

A device of the character disclosed, including a casing having inlet andoutlet portions and a partition wall Within the casing between saidportions, a valve seat carried by said partition, a bonnet secured tosaid casing, a pair of segmental shutters within the casing on theoutlet side thereof, intermeshing gears carried by said shutters, ashaft for actuating said gears to close or separate said segmentalshutters, a swing lever carried by said shaft, and la sleeve slidablymovable relative to said bonnet for engaging said swing lever to holdsaid swing lever to position the segmental shutters open or closed, anda valve protected against fluid impact when the shutters are closed andallowed to seat against said valve seat member when the shutters areopen.

FRAN K W. JOHNSON.

